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Summary:
Super force building a blueprinted assembler X ghost over an assembler Y ghost causes both requests to disappear (assembler level does not appear to matter).

Steps to reproduce:
Load attached save ghostshiptest.zip

Paste the blueprint from Game Blueprints -> "Illegally Smol" onto platform AA-BuildTarget

-This shows an Assembler 3 is requested along with the rest of expected materials

Quickly copy platform AA-BuildSource, and Super Force Build this over AA-BuildTarget.

-Ghost Assembler 3 is replaced with a Ghost Assembler 2, but both disappear from "Auto request missing construction materials". Toggling auto request off and on does not request either assembler.

This also works in reverse; copying AA-BuildSource and then Super Force Building the blueprint. Both assembler configurations do have module requests, however trying without modules in the assemblers appears to have the same result.

From further testing it appears to happen specifically when Super Force Build replacing a ghost for an entity that is still waiting on platform tiles to be built underneath, but possibly only when the waiting tiles themselves are also waiting on a ghost tile connection before being valid for building.

Thanks for the report, this is a duplicate of 134174.