Hi @lemret,
Sure, we’ll check it but I can’t promise any solution as I can’t reproduce this issue on my installation. In fact, this is just the second time I see this issue, but I haven’t reproduced it on any of my installation, nor other users sites. And if it’s true, then it should be the same even in old X 2.5 since it has the same coding format.
As you said, it only happens after the update so I don’t think it’s really the cause initially, which is why I like to confirm every possible cause to confirm it including the one from your provided URL as I’ve read that before. But again, I can’t access the site so I’ll try my luck reproducing the issue on my end 
I also recommend updating PHP in case it’s old, that’s because that comment from that URL about float issue was 14 years ago which may have been patch. That’s why I don’t see it anymore on any of installation.
Thanks!