Seconding the q*r thing - from very personal experience - but I don’t think that the LGBT tag also covers the games tagged LGBTQIA. You can search LGBTQIA as a separate tag and then filter out the games tagged LGBT (which then only leaves like, two games rip), and you can also tag your game BOTH LGBT and LGBTQIA. I’m pretty positive that searching a tag only gets what’s SPECIFICALLY tagged with LGBT, and not games that have tags that INCLUDE LGBT (such as the tag LGBTQIA, LGBT themes, etc).
This is just from my own time spent messing around with the search/tag filters, because I’ve been trying to find every game that fits under the umbrella and make collections for them, but yeah.