When summoning a falling block with command no.1 everything seems to work as intended, and a falling red wool block appears (time set to -9999999 in order to keep it from dying).
/summon minecraft:falling_block ~ ~ ~ {NoGravity:1b,Time:-9999999,BlockState:{Name:"minecraft:red_wool"}}
However when using the data command in order to change the Block State, the block model doesn't change even though the Block State is now changed.
/data merge entity @e[sort=nearest,limit=1,type=falling_block] {BlockState:{Name:"minecraft:blue_wool"}}
Fixes itself when relogging
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duplicates 1
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Thank you for your report!
We're tracking this issue as MC-72849, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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Duplicate of MC-72849 which was later marked as "Won't Fix". See the duplicated link for further details.