After a recent two-year audit aired concerns about the accuracy of the state's heritage register, the state opposition says the issues stem from under-resourcing in the office.

Though the numerous complaints against one staff member had been assessed, no investigation was opened. The "wrongdoing in part" uncovered by the investigation into the other was addressed under the State Service Act, the Department of Primary Industries, Parks, Water and Environment release states.

A search by the department located 90 pages of a final report which was deemed exempt from release. No further elaboration was provided on the nature of the complaints, wrongdoing, or disciplinary action taken.

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A government spokesperson said the office had procedures to investigate and address complaints. They added information on the matters had been provided through the RTI process, which was publicly available.

In a budget estimates hearing last month, Labor heritage spokeswoman Alison Standen asked then-Heritage Minister Will Hodgman about a six-month Integrity Commission investigation into a staff member alleged to have "solicited representations or submissions" objecting to works applications.

"[The complaints and investigation] really goes to the culture within Heritage Tasmania and I think that the bottom line there is the government has failed to invest adequately in heritage from back in ... 2014," Ms Standen said Sunday, referring to a project initiated that year to review and remove properties from the list.

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Ms Standen said questions raised in budget estimates last month still remained around whether the amendments made to correct issues raised in the recent register audit were carried out in accordance with the legislation, and whether this put the state at risk of legal action.

At the time, DPIPWE head Dr John Whittington said he had no concerns about the legal standing of the register as amendments to the Historic Cultural Heritage Act in 2013 had validated earlier entries lacking in required detail.

Mr Hodgman noted additional resources were allocated in the form of a fixed-term data and spatial officer in 2017 and two research officers in 2018.

On Sunday, Greens leader and heritage spokesperson Cassy O'Connor said further information should be provided on how the conduct complaints were addressed.

"A breach of the State Service Act is a very serious matter," she said. "It simply isn't good enough. It isn't transparent to provide no information on how the complaints were addressed."

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