CTM Overlay connectTiles not working with custom blocks in 1.12

[Majora101]

Hello, Just wanted to run this by someone as I'm not 100% sure on what syntax to use for connectTiles here. I've had success referring to vanilla blocks in connectTiles as 'grass_top' and such. I've successfully applied overlays to vanilla blocks connected to custom blocks by adding the custom block name under matchBlocks, ie: 'gss-decor:overworld_top', but using that syntax under connectTiles does not seem to work. I have also tried using the direct path to the tile using 'gss-decor:blocks\ges_grass_nihan_top', but no luck. The name of the custom block is 'ges_grass'. Any suggestions as to what I'm doing wrong are very appreciated!

Code:

matchBlocks=1-1 1:0 1:3 1:5 3 3:1 4 12 12:1 13 14
method=overlay
tiles=0-16
connect=block
connectTiles=gss-decor:blocks/ges_grass_nihan_top
tintIndex=0
tintBlock=2

[nihiluis]

I also tried a couple more variations, aiming at the texture located in minecraft/textures/blocks, like overworld_top_grass_light to no avail.