but will not allow to list standard game

This is already the listing for the base game [as in, SG is correctly pointing towards the base game through the API], but since the base game was removed from purchase, the publisher changed the store title [and for some reason, the label for the base game itself] to Definitive Edition, to match what was currently being sold through the page.

The API doesn't actually allow SG to point towards the Bundle [since Bundles don't properly send information through the API, similar to how DLCs don't send ownership information], but since the Bundle is the only listing on the store page, the store page ends up automatically using the value of the Bundle (even though the store page itself is still actually associated with the base game)

This arrangement actually has the same underlying basis as the situation where Daedelic packages will overwrite base game values when they go on sale and the base games do not; That is to say, the (currently) cheapest item actively listed on a store page will always send its information through the API for any calls related to that store page. Since the base game for Tomb Raider isn't listed, it skips directly to associating information from the Bundle.

tl;dr version: You've got the base game properly selected, Steam's API is just quirky.

Thanks for the giveaway!

Thanks :3

ty

Thank you for the chance!