Any updates to what I posted? Should I move it to a separate topic? In my case, I've clearly added the condition when a train should continue the route.

+1 From me.

The temporary stop of the train caused by the interrupt event remains infinite in a cycle, even though the condition for resuming the route has already been met.

What did you do?

I noticed that the train logistics in my factory had collapsed because a bunch of trains were blocking ...

Seems to be the same as in this topic https://forums.factorio.com/viewtopic.php?f=49&t=32646
The same packet is being dropped over and over. (Lost block 15649)
Please download the latest test executable from that topic (Factorio_0.14.21 Fix attempt+TransferTargetSource Logging 2.zip) and post the ...

In case people are still having this problem and want to help, I updated the executable that will log lots of data related to the file transfers on the client side.
Copy the 2 files in your bin folder and run the game using factorio-run.exe

Every time you connect to do a test, do it on a fresh run ...