Multi-line Text Box misleading text and cursor display

As requested by Tom_van_Stiphout, Language setting is English (UK) and region is UK.

Re Viorel's suggestion, I tried the font change on the form when attempting to debug initially as I'd read that there had been issues with the default Aptos font, but I wasn't using that and changing to other fonts made no difference.

Note, though, that I see the issue in the underlying table so the textbox and form properties don't appear to be the cause.

As an additional test, just to see if it was anything specific to the project I'd developed, I tried to replicate it in a new database and in Microsoft's Northwind Dev Edition DB.

I was able to replicate it so here's an example if you wish to try:

In the Products table go to ProductID 39 and edit ProductName to add a new line and type anything.
I just changed "Tea" to "Tea<return>X". Save and then you'll see the weird issue: just try going to the end of the Tea line and you'll see the cursor visually won't be at the end even though it actually is. Try typing and deleting to see the characteristics mentioned in the OP.

I've pointed you at this particular row as, curiously, it isn't necessarily an issue in another row (e.g., ProductID 38).

Obviously, if this doesn't replicate the issue for you then your setup is different in some way and you're not falling foul of the issue.

Hope that's useful. Let me know if anyone wants other info or checks.