Did a little patch to hopefully let your mod work with my new fork https://mods.factorio.com/mod/Transport_Drones_Continued_Fixed/

the patch is done

I changed some things and your mod now crashes.
I removed the pipe connections from the fluid box. That nil crashes.
The fluid conversion doesn't work as it needs to target the tank.

I put in a placeholder pipe that does nothing to help with the crash.

I see you found a temp fix on your end but I think I have removed references to pipe connections (I think it was code left over from tubs that wasn't needed anymore), so it should be safe to remove the temp fix with your next update.

Sounds perfect

Version 2.1.4 of Transport Drones Continuous broke compatibility with Transport Drones Fuel as per the changelog:

For mod authors: the technologies transport-system and
transport-buffering are now transport-basic and transport-advanced,
transport-deliveries is new, and transport-fluids and
transport-active-supply are gone. Saves keep their research.

As expected the technology is not found when loading this mod:
Transport_Drones_Fuel_revived__/technologies/transport_system.lua:3: attempt to index local 'base_tech' (a nil value)

Admittedly the change was made only a few hours ago, but is there any chance of you adopting this change?

Fixed the issue in "0.6.1". It was a hardcoded name in that file. Now it uses the value from tdf_shared.lua which handles most of the comparability for the various transport drones mods.