Cactuses have an “age” value that determines when the cactus grows. This is always 0 on the F3 screen for all cactuses.
Use the command
/setblock ~ ~ ~ minecraft:cactus{age:15}
to create a cactus on a sand block.Inspect this cactus with the F3 screen → the age is 0, not 15.
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We're tracking this issue in https://report.bugs.mojang.com/servicedesk/customer/portal/7/MC-265458 , so this ticket is being resolved and linked as a duplicate.
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