In the worldupgrade from 1.12.2 to 1.13.1 are several warnings:
Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
Unsupported key: PolarBear in TaggedChoiceType[id, minecraft:spawner_minecart -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), MuType[V1125_4]),[...]
What to do here?
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I'm getting the "Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner" message during world conversion to 1.14
Converting from 1.13.2 to 1.15.1, i get various mentions of this (nobody is logged in on the server)
```
[16:57:45] [Server thread/INFO]: 77% completed (33475785 / 43377684 chunks)...
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [pool-11-thread-15/WARN]: Unable to resolve BlockEntity for ItemStack: minecraft:light_gray_banner
[16:57:46] [Server thread/INFO]: 77% completed (33476499 / 43377684 chunks)...
[16:57:47] [Server thread/INFO]: 77% completed (33476985 / 43377684 chunks)...
[16:57:48] [Server thread/INFO]: 77% completed (33477521 / 43377684 chunks)...
```
The same for minecraft:spawner
Can be reproduced easily for example with the 'Uncharted Territory 3' map from https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/maps/1515043-amlups-uncharted-territory-series-new-map-in
After upgrading it also can be noticed that some of the instruction books are empty.