As coding enthusiast has pointed out... there was a bug reported here: https://github.com/spesmilo/electrum/issues/3788
It has been fixed and merged here: https://github.com/spesmilo/electrum/pull/3794

The next release should cure this issue. Seems the parsing of "Non MultiSig" SegWit P2SH transactions was broken.

If you are super desperate for the fix, you could probably clone the current Electrum repo and run from source.