Can not covert inference model to onnx using paddle2onnx

[wuxz]

Please fill in the information below so that we can solve the problem quickly, Thanks !

Describe the bug
A clear and concise description of what the bug is.
ubuntu 24.04, python 3.12

我按照官方文档，安装的是 paddlepaddle 3.3
onnx 1.17.0
onnxruntime 1.26.0
paddle2onnx 2.1.0
paddleocr 3.5.0
paddlepaddle-gpu 3.3.0
paddlex 3.5.2

我导出推理模型后，需要转换成 onnx 格式。
命令：
paddle2onnx --model_dir PP-OCRv5_server_det_infer --model_filename inference.json --params_filename inference.pdiparams --save_file det.onnx --opset_version 19

出错信息：
[Paddle2ONNX] Start parsing the Paddle model file...
[Paddle2ONNX] Use opset_version = 19 for ONNX export.
2026-05-20 14:02:31 [ERROR] Failed to convert PaddlePaddle model: (Unimplemented) the 0th elementwise MUST be ir::FloatAttribute
[Hint: Expected array_list[0].isa<::pir::FloatAttribute>() == true, but received array_list[0].isa<::pir::FloatAttribute>():0 != true:1.] (at /github/workspace/paddle2onnx/parser/pir_parser.cc:814)

Informations (please complete the following information):

• Inference engine for deployment: paddleocr 3.5.0
• Why convert to onnx：在嵌入式设备上推理
• Paddle2ONNX Version: 2.1.0
• Email/Wechat/Phone: wooxz@hotmail.com

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