drowaudio-flanger hangs during Ardour 7 plugin scanning

On Ardour7.1.0 (latest Archlinux Package, 7.1-1) , during a complete plugin scan , drowaudio-flanger (latest distrho-ports Archlinux package, 2021.03.15-2) hangs, and requires skip. After the scanning that 

[Info]: Scanning: /usr/lib/vst/drowaudio-flanger.so
corrupted size vs. prev_size while consolidating
Scan was cancelled.

is the Ardour message in plugin manager