Will Selling Marginable ETFs After Shorting a Put Trigger a Margin Call?

Vanguard gives you 50% margin cash based on your marginable assets. Lets say I have $100,000 invested in an ETF, and $50,000 in margin cash on Vanguard.

I short a put for $500 strike, using 100% of my margin balance.

Then I liquidate $20,000 of my ETF into cash.

Will this result in a margin call since after liquidating, I have $80,000 left in the ETF which is marginable at 50% so my new max margin is $40,000, while I have $50,000 in margin cash in an open contract?

Or does my $20,000 of cash negate that? (Cash is not marginable in Vanguard)