The NBT tag "BeamTarget" from End Crystals does not allow decimal values. It allows you to "set" a decimal value, but it is not truly set (the decimal value is transformed into the whole number that goes below it, "floor" function). It can be seen in the images.
TO REPLICATE:
Summon an End Crystal - /summon minecraft:end_crystal ~
Modify the NBT tag - /data modify entity @e[type=minecraft:end_crystal,limit=1,distance=..10] BeamTarget.X set value 1.5
Read the changed data - /data get entity @e[type=minecraft:end_crystal,limit=1,distance=..10]
Notice that in the coordinate X of the NBT tag "BeamTarget" (shown as BeamTarget: {X: ##, Y: ##, Z: ##}) has been eliminated the decimal part.
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Can confirm in 20w49a. The command does allow you to input decimal values however, when the data is read, the decimal values do not display.
This is a issue with minecraft using BlockPositions (which are just pointing at a block, not a location) for the setBeamTarget method despite the fact that the EnderDragonRenderer class has a method for the same thing, which supports floats for coordinates, that points the closest end crystal to the closest ender dragon.
This bug limits end crystal usage by a lot, as only allowing whole numbered coordinates makes any sort of custom movement look very choppy.
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