The competition would have been Lin's first since the Olympic Games success in Paris, where there were also controversies surrounding her and Algeria's Olympic gold winner Imane Khelif.
Both were disqualified in a gender test by the International Boxing Federation IBA in 2023. However, the International Olympic Committee, IOC, which banned IBA, said the test was not valid and gave both boxers the green light in the Olympic Games.
New World Federation
"She is a woman, has cleared all criteria for participation and participated successfully in the Olympic Games where she won gold", writes Taiwan's sports federation in a statement after the new controversy.
The major tournament in Sheffield is arranged by World Boxing, the new world federation.
Taiwan's sports federation criticizes the new federation's medical regulations.
"It still lacks the IOC's clear rules that ensure the athletes' rights are protected".
Lin had offered to undergo a thorough medical examination in the UK, something World Boxing said no to.
Taiwan's sports federation therefore decided, "to protect Lin from further pain", to remove her from the starting field.
The Prime Minister has spoken out
Taiwan's Prime Minister Cho Jung-Tai said on Wednesday that the government "will actively work to protect and secure" Lin's right to participate in future international competitions.
World Boxing, however, claims that Lin was never registered for the competition and that the federation's guidelines do not prevent her from participating. It is up to Taiwan's federation to decide which boxers they want to register for the competition, says a spokesperson for World Boxing.