Could not load module error incorrectly suggests main library

E.g. when I try to load the module in GHCi:

<no location info>: error: [GHC-87110]
    Could not load module ‘FormatPage’.
    It is a member of the hidden package ‘lsm-tree-0.1.0.0:prototypes’.
    You can run ‘:set -package lsm-tree’ to expose it.
    (Note: this unloads all the modules in the current scope.)

GHC suggests :set -package lsm-tree which is wrong (except if it loads all units matching the package, but it's also not great).

GHC knows the unit is not a main module:

% ghc-pkg-9.8.2 --package-db dist-newstyle/packagedb/ghc-9.8.2 describe z-lsm-tree-z-prototypes-0.1.0.0
name:                 z-lsm-tree-z-prototypes
version:              0.1.0.0
package-name:         lsm-tree
lib-name:             prototypes

The package-name and lib-name are different.

Similarly, when building

src/Database/LSMTree/Monoidal.hs:91:1: error: [GHC-87110]
    Could not load module ‘FormatPage’.
    It is a member of the hidden package ‘lsm-tree-0.1.0.0:prototypes’.
    Perhaps you need to add ‘lsm-tree’ to the build-depends in your .cabal file.

the lsm-tree is incorrect, GHC should suggest lsm-tree:prototypes.