Ann: DSK FY21 Investor Presentation, page-30

WAM started selling on 1 July, so they wanted to window dress 30 June numbers.

However, the stock held up through July, despite the obvious impact of lockdowns.
So a more cynical explanation is that Catalyst are perhaps a forced seller after this result. They can sell their remaining shares as IPO escrow ends, and have held DSK for a long time in a PE fund and need to realise the investment.
If I was WAM and still liked the company, I'd sell into the FY21 result, forcing down the price Catalyst has to sell for post result, and scoop up Catalyst's shares.
Lockdown impacted result is clearly not going to see a tonne of new buyers come and and take away the opportunity.