Surrendering victory against Leicester City in a 1-1 draw, Parkinson witnessed a familiar flaw resurfacing in the dying moments at the SToK Cae Ras.
The Red Dragons were bidding to respond positively to their 2-1 defeat by Norwich City and, for long periods, looked to have done exactly that.
Lewis O’Brien’s fourth goal of the season midway through the second half had Wrexham on course for three precious Championship points and, with results elsewhere going in their favour, briefly lifted them into the play-off places.
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Instead, Jannik Vestergaard’s 90th-minute equaliser denied the hosts a famous win and underlined a recurring issue that continues to undermine their promotion push.
“You take the moment at the end out of it, I'd be saying it was a really gritty, hard-working performance and a great response from the weekend,” said Parkinson.
“But the gloss is taken off it because we haven't dealt with a ball into the box.”
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Wrexham’s control of the contest made the outcome particularly difficult to digest.
Leicester, who had offered little after falling behind, managed just one shot on target in the entire second half – the effort that ultimately earned them a point.
“We're frustrated but apart from one counter attacking moment in the second half, we weren't troubled in the whole night,” Parkinson added.
“There was a silence at the end because I think everybody knew that we've deserved the three points, but you sometimes don't get what you deserve.
“But we've got to make sure that we concentrate right to the end.”
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The sense of disbelief inside the stadium was understandable.
A ball into the box was not dealt with decisively and Vestergaard pounced to fire past Arthur Okonkwo, turning what looked like a landmark victory into another example of points slipping away late on.
The statistics are stark. Wrexham have now dropped 20 points from winning positions – more than any other side in the division.
Had they managed to retain even half of those, they would currently be sitting second rather than ninth.
Left wing-back Liberato Cacace did not shy away from the disappointment, admitting the mood at full-time reflected the shock of another late concession.
“A real sucker-punch,” said Cacace, the Wrexham left wing-back.
“But we should be switched on when 1-0 up in the dying seconds of the game. You have to be switched on for 95 minutes, especially against a good side like Leicester.
“They can hurt you and they did that. We have to learn from these. The boys need to pick themselves up and go again Saturday.
“We were quite stunned, to be fair. That’s also the vibe I got from the rest of the stadium.”
Parkinson struck a philosophical tone at the final whistle, echoing a sentiment that has become familiar this season.
“The silence at the end suggested everyone knew we deserved the three points,” he added.
“But, sometimes, you don’t get what you deserve.”
It is a line that sums up much of Wrexham’s campaign. From the opening-day collapse at Southampton to costly draws against Sheffield Wednesday, Derby, Birmingham, Middlesbrough, Preston, Watford and now Leicester, the inability to close out matches has repeatedly stalled their momentum.
Despite that, the performance itself offered encouragement.
If Wrexham can combine the grit and control shown against Leicester with greater concentration in the final moments, the play-offs remain firmly within reach.
