Haven't tested with the upgraded chainsaws.
Currently using as part of DNS Techpack.
Running TechReborn 1.12.2-2.10.3.386
RebornCore 1.12.2-3.5.3.174
Forge 1.12.2-14.23.1.2555
Also running Treechopper 1.12.2-1.2.4
Not sure if Treechopper is relevant but it's possible it's effecting it.

Chainsaw works great except it continues to work on 0 power. Full cutting speed even on 0 energy.