kimi to no dogfight - they meet in a game and both like each other but they meet up thinking the other was a girl. They also go to the same school. It’s a really cute story. https://www.mangago.zone/read-manga/kimi_to_no_dogfight/
and then maybe netkama punch, you might have read it but one of them cat fishes the other. Again it’s a really cute story, although it’s not what you asked just thought I would put it out there.
These are all GLs:
https://www.mangago.zone/read-manga/handsome_girl_and_sheltered_girl/
https://www.mangago.zone/read-manga/fall_in_love_with_the_empress_zephyr_scans/
https://www.mangago.zone/read-manga/itsuwari_no_marigold/
https://www.mangago.zone/read-manga/prince_prince/
https://www.mangago.zone/read-manga/unaware_his_majesty_is_a_girl/
https://www.mangago.zone/read-manga/flower_flower/
https://www.mangago.zone/read-manga/the_noble_lady_on_the_edge_of_the_cliff_wants_to_make_the_dark_knight_fall_in_love/
https://www.mangago.zone/read-manga/kiraware_majo_reijou_to_dansou_ouji_no_kon_yaku/
https://www.mangago.zone/read-manga/the_playgirl_and_the_prince/
https://www.mangago.zone/read-manga/himitsu_no_hanazono/
BL or GL where they mistake the love interest for the opposite gender at first (like green yuri) OR where both mistake each other for the opposite gender