No Exit Passport Stamp from France

Has anybody recently returned from France back to the UK and not had their passport stamped by French Border control on exit?

We returned 28/05/22 via DFDS at Dunkirk and were just waved through French border check, didn't even look at our passports, the UK Border Control window did look at them and swiped them. We departed to France via Eurotunnel on Sunday 23/05/22 when we did get a French entry stamp. So we're a bit concerned that our passports look like we've entered the EU but not departed (or at least there's no evidence of complying with the 90 day rule). Our last trip to Gran Canaria (by air) in April 22 we had both entry & exit stamps, ditto France in Sept 21 (by ferry).

I asked at the information desk on the ferry and was told that many other people had also asked this recently and not to worry as it was now electronic, recorded when the passport is swiped. I've found little evidence to support this though, other than the EES system, but it seems implementation of this isn't until later this year (Sept).

I'd be interested to hear any members recent experiences on this, particularly anybody who also didn't have an exit stamp.