I see this while fishing in 1.20.12 PS4 Bedrock. (playing on PS5) I got it on video happening 3 times (two of those in a row) here:
I experienced this bug on an old PS4 world I been playing in 1.16, in a village I created from scratch in a new area. I've also reproduced it in a world I just made in 1.16.200 release version. I started in creative mode and made the bare minimum of a village: A simple house with door and bed, a bell, a composter, and a villager. I gave myself tons of emeralds and a stack of pumpkins, and placed a chest. I used emeralds to unlock the second tier quickly and the pumpkin trade was available. I switched personal game mode to survival, stored all but six pumpkins in the chest, faced south, placed the pumpkins, and broke them again. Then I tried trading but it would not work. So apparently the direction you are facing when placing/breaking the pumpkins is altering the items enough that the trader doesn't recognize them as pumpkins. In my old world I found that by facing north when placing/breaking the pumpkins, the trade would work.
Arrows do work on the invisible ghosts, and swords on the visible frozen body.
I have killed invisible mobs using a sword by attacking the frozen visible body rather then the invisible ghost. (I even recorded a video of me killing an invisible skeleton that was in my XP farm by going to where I figured the frozen body was and killing it. But it was too big to upload here.) For my XP farm, the bodies seem to get frozen in the same spot. I think I have attacked a ghost without success via bow, but I don't know for sure and I can try it again next time one shows up in my XP farm. XP from killed invisible mobs seems to drop at the location of the ghost rather then the body.
As a sidenote, I've had this bug happen to a pair of chickens at the same time, and also had it happen two a couple of horses. (And a zombie villager.) In the case of the chickens, I removed a shulker box that they had been standing on and they froze. I could still hear them, but they were standing on thin air and not moving, I didn't realize it was this bug at first so I tried various methods to get them down to the ground, nothing worked. (At some point I think that the invisible chickens got out of that base when I opened the door because when I reloaded the game the chickens were gone.) In the case of the horses, I encountered a couple of wild horses and tried to tame them. The first horse froze right after bucking me off the first time, so once I realized that I tried the second one. It happened again the exact same way. So that might be useful for trying to reproduce the bug. After reloading the save, the horse I tried worked fine and they were some distance away from where their frozen bodies were before reloading the save. All of this was done in PS4 Bedrock singleplayer.
In further experiments, I've found that to kill the affected mobs (as a workaround until this gets fixed) you have to find and kill the frozen body. Though that didn't seem like that was working the first time I experienced this bug. The first time I quit and re-entered and the affected mob seemed to appear some distance from the frozen image.
Am experiencing this in 1.16.100 Bedrock on PS4, most obviously seen with skeletons. (Just built an XP farm using a skeleton spawner.) Haven't seen the frozen mob model in the XP farm (it's likely in an area I can't see) but have seen it elsewhere in the same world. May have happened with multiple mobs at once. (judging by the number of shield impacts during one occasion) Only remedies I've found are quitting or switching to peaceful mode and back. Arrows shot by invisible skeletons are visible, but the invisible mobs are unkillable and the frozen mob bodies don't respond to being attacked either. (An invisible creeper would probably still blow itself up, but I can't say for sure that I've encountered one of those.) I did not have this problem prior to 1.16.100. I can't say that I've seen shadows of invisible mobs.
Based on my XP farm, the odds for a mob to be invisible seem to be pretty low, but I don't have any theories as to why.
Was a little worried until I got here and saw the helper's comment: This wasn't marked resolved because they aren't going to fix it, but because this is considered a duplicate of the other bug report, which has a lot more info. I voted on and am watching both.
In my experience, at the moment multiplayer on Android seems to require using wifi. If wifi isn't on, the game turns multiplayer off. Also happens when trying to use Mobile Hotspot as listed in the issue below.
FYI, I'm having the same issue (multiplayer turning off) with mobile hotspot off, cellular data on, with working internet.
Android 1.12.1
Having this problem with 1.12.1 on android. It just won't start a multiplayer game. Also, not sure if it's related, but it also won't let me create a realm, it complains about wifi not being on. (4G LTE should be sufficient for Minecraft and I don't have wifi internet.)
This problem has happened to me multiple times on Switch with 1.8.1.
Last time I saved and quit to the menu, deleted an old copy of my world, made a new copy, loaded it, and got the respawn screen. When I saved I was safe inside a well lighted home I made on a well lighted island. This is just a guess at the moment, but I'm thinking my items got dropped off at the world's default spawn point. (The area you were at when you first started the world.)
As a workaround, I made another world with Keep Inventory on to use until this gets fixed.
Have been having this problem with 1.20.15 PS4 Bedrock on a PS5.