geany-plugin-projectorganizer: Depends: geany-abi-18176 but it is not installable
That's typical for Sid. geany-plugin-projectorganizer is still version 1.33+dfsg-1+b1 and expects geany-abi-18176, while geany is already version 1.34.1-1 and provides geany-abi-18432. Just wait some mirror syncs.