If you enter the command
/summon minecraft:text_display ~ ~ ~ {text:'{"text":"Hello"}', transformation:{scale:[5.0f, 5.0f, 5.0f]}}then change the size not at all. It could be that I just didn't do it right but I think so.
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As mentioned in MC-259838
When setting the transformation using the decomposed forms, you need to put all 4 parts, they are not optional. For example this command would work:
/summon minecraft:block_display ~ ~ ~ {block_state:{Name:"minecraft:stone"},transformation:{translation:[0f,0f,0f],left_rotation:[0f,0f,0f,1f],scale:[5f,5f,5f],right_rotation:[0f,0f,0f,1f]}}
I'll forward-resolve this as a duplicate of MC-259838, since it's the same issue but that bug report is a lot more detailed.
Caused by MC-259838