I’m sorry I haven’t responded. My family is finally finished with a fun round of stomach bugs.
Were you by chance talking with @neilh or did you just happen to get to the same place at almost the same time coincidentally? Neil wrote up a fix for this in the SensorModbusMaster library, which I just accepted. If you update that library, you should be getting the fix. It might take 24 hours or so for the PlatformIO registry to catch the update on the library; if you’re ready to get the fix NOW you can uninstall and reinstall SensorModbusMaster using the github link instead of the library name.
With the fix in SensorModbusMaster, is it finally working for you?
I”m sorry for not being more helpful sooner!