ConnectivityExtension: ConnectivityExt jar file not present
After some searching around, it turns out ConnectivityExt is a proprietary Qualcomm file (source - you can see that it is included in the proprietary-files.txt in LineageOS), related to the Qualcomm package com.qualcomm.qti.tetherstatsextension.tetherstatsreporting. I found some code  for this here, line 107 onwards. As it seems to be about TetherStatsReporting, maybe it is related to hotspot? Considering it is proprietary I do not think you can do anything about it.