Can destroy unreachable blocks by constantly jumping and holding left click

I believe this is intended, not too sure about that tho. There's an old report about this (MC-71999) which essentially describes the same, but it has been fixed in 1.10.2.

I'll call that related because my report is about breaking the block instead of the mining being paused.

the mining will pause, instead of reverting to a non-mined block

What's your report about then?

I think he means that you can slowly mine unreachable blocks by holding the jump and mine keys

Yes, that's what I mean.

Yeah, MC-71999 also describes this. I still don't know what should be different with your report.

Also, MC-69865 describes something similar.

I don't know, the fact that you can break them.

Can confirm, might be intended.

Probably works as intended. Hopefully.