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Similar to this known issue, but I cannot verify that it is the same due to the full description of the bug becoming inaccessible.

Trying to combine 2 fluid "networks" containing the same fluid produces a "Cannot connect systems with different fluids" error if one of the systems is already connected by pump to a different fluid system. However, if you try to combine the "networks" with a ghost pipe, a construction bot will happily allow it.

Because the pump is one-way, connecting the systems does not induce fluid mixing, so I expected the game to allow me to place down the pipe and connect the systems together. I also expected manual placement and bot placement to follow the same rules for legal construction.

To replicate:
1) fill 2 storage tanks with 2 different liquids 2) empty one of the storage tanks with a pump 3) fill the now empty tank with the second liquid. Despite the first liquid (here, crude) having no possible way to mix with the second (petroleum gas), connecting the two networks with a pipe is blocked. To fix, delete the pump. Alternatively, you can use a construction bot to connect the two networks instead. This happens consistently. A save file demonstrating this and the corresponding log file have been attached below.

This is the same as the other not a bug you linked.

Not a not-a-bug, it's linked under known issues.

Would you be looking into "known not a bug" topic if there would be one? the other topic is in the "Not a bug" subforum.

When looking at the instructions for how to submit bug reports, the topic linked to this post of known issues. I found the fluid post there.

And I've expanded on it at least, the inconsistent behavior between manual building and bot building in this scenario cannot be a feature.

mpreborn wrote: Tue Aug 16, 2022 9:15 pm When looking at the instructions for how to submit bug reports, the topic linked to this post of known issues. I found the fluid post there.

And I've expanded on it at least, the inconsistent behavior between manual building and bot building in this scenario cannot be a feature.

Did you read the linked blog post from the post you linked? https://www.factorio.com/blog/post/fff-351. It is an intended feature, but of course it does cause confusion as well.

For more info, read https://factorio.com/blog/post/fff-312, and https://factorio.com/blog/post/fff-274 ("Fluid mixing" section).