@davidm, this bug sadly was not found during the beta period for the last released version. Would you be interested in helping test out the beta versions before official releases? They happen usually monthly.
Sure, I’ll be happy to help - Shotcut is a fantastic product and I’m very pleased with what it allows me to do.
However, I should warn you that I’m nowhere near an expert user - I’m essentially a newbie and likely wouldn’t be testing out any complicated or esoteric areas in the product. (But I guess this markers bug isn’t in a very esoteric area :-).)