I made a post a few minutes ago for the same issues before realizing this post was here. When I went into the office this morning, my battery was already at 88% after charging overnight, so I placed my XS MAX on my wireless charger on my desk, and it shows its charging and even has the icon at the top right showing its charging but yet my battery is now down to 83% (So it seems like its not actually charging at all)
One night it was on the wireless charger overnight and did not charge at all so my phone was at 20% and wouldn't even charge once I plugged into actual hard wire Apple charger. Luckily this is not daily but I am not sure what the issue is, and I am glad to see its not just me and I am not going crazy.
Using iOS13 Public Beta on latest 3rd release.
I just rebooted the phone and it did start charging again.