Vines are difficult. Help please

You would need to make a condition with the 'block face event/target entity is looking at' function that only returns true if the function returns 'down.' (You can add a placement condition in the 'advanced properties' tab.) From there, you can add a procedure with the 'on neighbor block changed' trigger that breaks and drops the block if the block above doesn't have a solid down-face, (Use the 'is face of block solid' function), or isn't another instance of the vine block.

You will probably need additional procedure to determine whether the block should be a middle or tip variant, (if you want it to be exactly like glowberries.) You should be able to enable 'climbable' surfaces in the advanced properties tab, but I haven't personally tried this, and it may just be for ladder-like blocks, not non-solid climabable blocks. (If it doesn't work, there may be some workarounds you could try with the 'override motion delta' function, but they're a bit more complicated.)

Let me know if some pictures would be helpful!

Placement conditions are in the bottom right corner of the 'Advanced Properties' tab when creating a block, you should see a section that says 'Block Valid Placement Condition.' You can link this to a procedure, but the procedure must return a logic value. (So the procedure needs to check if the position is air with a solid block above it and return true if this is the case, or false if it isn't- you can find 'return' functions in the flow control tab when creating a procedure.)

The ladder properties thing is just a little checkbox in the middle of  'Advanced Properties,' but I'm still not sure it'll work for a full sized block. There's probably a separate bit of code you'd have to add in manually.