Hi Cédric, thanks for reporting! And sorry that it took me that long to answer.
To check if the issue is qutebrowser or webengine related usually we suggest to try if the bug is reprodudcible with falkon (another browser using webengine) If the bug also happens in falkon its with webengine. Else it might be a qb bug. Best regards Fritz
signature.asc
Description: PGP signature