diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index 74b63951fa961..e45154157c287 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -3956,19 +3956,21 @@ static bool zend_compile_call_common(znode *result, zend_ast *args_ast, zend_fun
 	if (args_ast->kind == ZEND_AST_CALLABLE_CONVERT) {
 		opline = &CG(active_op_array)->opcodes[opnum_init];
 		opline->extended_value = 0;
+		/* opcode array may be reallocated, so don't access opcode field after zend_emit_op_tmp(). */
+		uint8_t opcode = opline->opcode;
 
-		if (opline->opcode == ZEND_NEW) {
-		    zend_error_noreturn(E_COMPILE_ERROR, "Cannot create Closure for new expression");
+		if (opcode == ZEND_NEW) {
+			zend_error_noreturn(E_COMPILE_ERROR, "Cannot create Closure for new expression");
 		}
 
-		if (opline->opcode == ZEND_INIT_FCALL) {
+		if (opcode == ZEND_INIT_FCALL) {
 			opline->op1.num = zend_vm_calc_used_stack(0, fbc);
 		}
 
 		zend_op *callable_convert_op = zend_emit_op_tmp(result, ZEND_CALLABLE_CONVERT, NULL, NULL);
-		if (opline->opcode == ZEND_INIT_FCALL
-		 || opline->opcode == ZEND_INIT_FCALL_BY_NAME
-		 || opline->opcode == ZEND_INIT_NS_FCALL_BY_NAME) {
+		if (opcode == ZEND_INIT_FCALL
+		 || opcode == ZEND_INIT_FCALL_BY_NAME
+		 || opcode == ZEND_INIT_NS_FCALL_BY_NAME) {
 			callable_convert_op->extended_value = zend_alloc_cache_slot();
 		} else {
 			callable_convert_op->extended_value = (uint32_t)-1;
@@ -8090,6 +8092,8 @@ typedef struct {
 	bool varvars_used;
 } closure_info;
 
+static void find_implicit_binds(closure_info *info, zend_ast *params_ast, zend_ast *stmt_ast);
+
 static void find_implicit_binds_recursively(closure_info *info, zend_ast *ast) {
 	if (!ast) {
 		return;
@@ -8134,7 +8138,15 @@ static void find_implicit_binds_recursively(closure_info *info, zend_ast *ast) {
 	} else if (ast->kind == ZEND_AST_ARROW_FUNC) {
 		/* For arrow functions recursively check the expression. */
 		zend_ast_decl *closure_ast = (zend_ast_decl *) ast;
-		find_implicit_binds_recursively(info, closure_ast->child[2]);
+		closure_info inner_info;
+		find_implicit_binds(&inner_info, closure_ast->child[0], closure_ast->child[2]);
+		if (inner_info.varvars_used) {
+			info->varvars_used = true;
+		}
+		if (zend_hash_num_elements(&inner_info.uses)) {
+			zend_hash_copy(&info->uses, &inner_info.uses, NULL);
+		}
+		zend_hash_destroy(&inner_info.uses);
 	} else if (!zend_ast_is_special(ast)) {
 		uint32_t i, children = zend_ast_get_num_children(ast);
 		for (i = 0; i < children; i++) {
diff --git a/ext/mysqli/tests/fetch/mysqli_fetch_all_data_types_variation.phpt b/ext/mysqli/tests/fetch/mysqli_fetch_all_data_types_variation.phpt
index 594980ec0f829..81c15d53b84cb 100644
--- a/ext/mysqli/tests/fetch/mysqli_fetch_all_data_types_variation.phpt
+++ b/ext/mysqli/tests/fetch/mysqli_fetch_all_data_types_variation.phpt
@@ -4,6 +4,9 @@ mysqli_fetch_all() data types variation
 mysqli
 --SKIPIF--
 <?php
+if (getenv('GITHUB_ACTIONS') && str_starts_with(php_uname('m'), 'ppc')) {
+    die('skip Flaky on GitHub Actions PPC runner');
+}
 require_once dirname(__DIR__) . "/test_setup/test_helpers.inc";
 mysqli_check_skip_test();
 ?>
diff --git a/ext/opcache/tests/gh19867.phpt b/ext/opcache/tests/gh19867.phpt
new file mode 100644
index 0000000000000..486a366722dad
--- /dev/null
+++ b/ext/opcache/tests/gh19867.phpt
@@ -0,0 +1,36 @@
+--TEST--
+GH-19867: Avoid capturing nested arrow function parameters
+--EXTENSIONS--
+opcache
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.opt_debug_level=0x20000
+--FILE--
+<?php
+fn() => fn($a, $b) => $a + $b;
+?>
+--EXPECTF--
+$_main:
+     ; (lines=%d, args=0, vars=%d, tmps=%d)
+     ; (after optimizer)
+     ; %s
+0000 T0 = DECLARE_LAMBDA_FUNCTION 0
+0001 FREE T0
+0002 RETURN int(1)
+
+{closure:%s:%d}:
+     ; (lines=%d, args=0, vars=%d, tmps=%d)
+     ; (after optimizer)
+     ; %s
+0000 T0 = DECLARE_LAMBDA_FUNCTION 0
+0001 RETURN T0
+
+{closure:%s:%d}:
+     ; (lines=%d, args=2, vars=%d, tmps=%d)
+     ; (after optimizer)
+     ; %s
+0000 CV0($a) = RECV 1
+0001 CV1($b) = RECV 2
+0002 T2 = ADD CV0($a) CV1($b)
+0003 RETURN T2
diff --git a/ext/opcache/tests/gh19984.phpt b/ext/opcache/tests/gh19984.phpt
index 4584fa6494c18..cb49869f5cf05 100644
--- a/ext/opcache/tests/gh19984.phpt
+++ b/ext/opcache/tests/gh19984.phpt
@@ -14,6 +14,10 @@ if (!function_exists('pcntl_fork')) die('skip pcntl_fork() not available');
 <?php
 $pid = pcntl_fork();
 require __DIR__ . '/warning_replay.inc';
+if ($pid) {
+    // Wait for child to output its error message.
+    pcntl_waitpid($pid, $status);
+}
 ?>
 --EXPECTF--
 Warning: Unsupported declare 'unknown' in %s on line %d
diff --git a/ext/standard/tests/general_functions/proc_open_multiplex.phpt b/ext/standard/tests/general_functions/proc_open_multiplex.phpt
index 63e856b29c31e..798b5e74c475e 100644
--- a/ext/standard/tests/general_functions/proc_open_multiplex.phpt
+++ b/ext/standard/tests/general_functions/proc_open_multiplex.phpt
@@ -1,5 +1,11 @@
 --TEST--
 Multiplexing of child output
+--SKIPIF--
+<?php
+if (getenv('GITHUB_ACTIONS') && str_starts_with(php_uname('m'), 'ppc')) {
+    die('skip Flaky on GitHub Actions PPC runner');
+}
+?>
 --FILE--
 <?php
 $php = getenv("TEST_PHP_EXECUTABLE");