Difficulty tiers have been adjusted for the following maps:

hb_abubas extreme -> death
gbc_hb_hoLy extreme -> extreme-death
hama_bama extreme -> extreme-death
kzpf_research extreme -> extreme-death
hb_k1nomoto extreme -> extreme-death
hb_mekko2 extreme-death -> death
kzcn_zhupisb_x extreme-death -> death
hfr_core_vvn1ght_d extreme-death -> death
ffy_kenzo_x extreme-death -> death
gbc_script_x death -> extreme-death
hama_bhopp death -> extreme-death
eternal_blossom extreme-death -> death
r3_hb_envy extreme -> extreme-death
phz_oasis_temple extreme -> extreme-death

Maps that exceed the extreme tier are excluded from cup voting.
Thanks to topoviygus for proposed changes.