Landmark transgender reforms that would make mentioning gender on Tasmanian birth certificates optional have been delayed until next year.
A legislative council debate on the bill was on Thursday night deferred until March, with some independent MLCs saying it needed further amendments.
The reforms, brought forward by the Labor opposition and Greens but opposed by the state government, last week passed the lower house when rogue Liberal Speaker Sue Hickey crossed the floor with her deciding vote.
The legislation allows people aged 16 or older to change the gender on their birth certificate by filling out a statutory declaration.
It also allows parents to decide whether their child's gender is displayed on birth certificates.
Independent MLC Ivan Dean says he believes the legislation is "flawed" after receiving briefings from the solicitor general, chief parliamentary council and registrar of births, deaths and marriages.
"There was inconsistency throughout the legislation, there was different terminology, no defining of terminology. It was really all over the place," he told ABC Radio.
Attorney-general Elise Archer has previously said the amendments are legally untested and highly problematic.
All states and territories have until December 9 to pass legislation that ends the need for people to divorce in order to officially change their gender.
That move is agreed to by all Tasmanian parties but Labor and the Greens last week added a range of transgender reforms to the bill with the vote of Ms Hickey.
Proponents say the amendments would make the lives of transgender and gender-diverse people in Tasmania simpler.
Martine Delaney, transgender activist and Transforming Tasmania spokeswoman, is disappointed the bill has stalled.
"We will fight for this legislation right up until parliament returns because it is about our lives and our fundamental human dignity," she said.
The state government has offered parliamentary counsel to help MLCs draft amendments.
Prime Minister Scott Morrison last week lashed the push to make gender optional on Tasmanian birth certificates as "ridiculous".
The Australian Christian Lobby said the removal of gender on birth certificates was ignoring biological truths.
The Northern Territory on Thursday passed laws allowing people to change their gender without sex reassignment surgery.
