This has been an ongoing issue of mine since the purchase of my 3rd Gen.  Seems they have settled in now but I do keep a check on them.  The first few months was bad.  I have a spoke tension meter so just keep a check on them, usually when I have to adjust brakes. 

I have a 2019 Radwagon and use the Beck Dual 65L bags from Holland Bike Shop.   https://hollandbikeshop.com/en-gb/bicycle-bags/double-panniers/?page=1

You have to deal with a bit more shipping expense but the bags are inexpensive vs those found in the US of similar quality.   I have had them on the bike for a few thousand miles now and they are fantastic.  Very simple design and never have any water issues.  I just throw all kinds of stuff into them, often putting a backpack in one of them that is easy to throw in and take out.  To install them I did remove the rear wood board and install the webbing under that then reinstall the board.  The downside is that you can't easily remove them but then the upside is that those up to no good can't easily remove them.  I bought the lime green version and they make the bike much more visible as well.