An issue with the laws - that have been in operation since 1987 - was picked up on March 31 as part of trespass criminal proceedings against Bob Brown and other protesters, who had their charges dropped as a result.

The issue centred on an instrument of delegation for forest practice officers, and covered all forms of forestry in Tasmania - both plantation and native.

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The Forest Practices Authority determined that logging could continue in the interim while the government drafted legislation. Parliament had been delayed several weeks due to a countback in Bass.

In the meantime, the Bob Brown Foundation carried out protests at several forestry sites where they were not arrested.

Resources Minister Guy Barnett wrote to parliamentarians on Monday confirming the validating legislation would be introduced "when parliament resumes".

"The Bill seeks to resolve what can be described as a highly technical administrative matter," he wrote.

"To be clear, the issue at hand is related to the construction and form of instruments of delegation, not the safety or appropriateness of forestry operations undertaken on-ground.

"Rather than have the instruments called into question solely due to the manner in which they have been administratively constructed, the Bill has been drafted in a way that seeks to remove doubt as to the validity of instruments issued pursuant to section 43 of the Act."

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The laws confirm the power of delegation for the chief forest practices officer.

It also includes a section that any delegations made before the new laws come into force "is taken to be, and to always have been, validly made on the relevant day", meaning they are retrospective.

Labor is likely to support the passage of the laws through parliament, with a major party majority in the upper house.

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The Tasmanian Greens had been calling for compensation for anyone held in custody and ultimately prosecuted under the laws spanning several decades.

Greens leader Cassy O'Connor said she was concerned the government will "ram" the legislation through.

"It's a sad start to Jeremy Rockliff's first day in Parliament as Premier," she said.

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