Manchester United's impressive winning sequence under new manager Ruben Amorim came to a halt at the City Ground, as Nottingham Forest secured a dramatic 2-2 draw.
The Portuguese tactician had overseen three consecutive victories against Sunderland, Liverpool and Brighton since taking charge, but his side could only manage a single point despite leading at the interval.
The result maintains United's unbeaten record under their new boss, though the manner of the dropped points will concern supporters.
A commanding first-half display gave way to defensive lapses after the break, before late drama ensured the visitors avoided defeat in the East Midlands.
Amad Diallo scored a late equaliser for United to spare Ruben Amorim's blushes
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United appeared in control following Casemiro's header in the 34th minute, which came from a corner decision that sparked debate.
The Brazilian midfielder found the net past Matz Sels to give the visitors a deserved advantage at the break.
However, Sean Dyche's Forest emerged transformed after the interval. Within five minutes of the restart, the home side had completely reversed their fortunes.
Morgan Gibbs-White levelled proceedings with a header in the 48th minute, before Nicolo Savona struck just two minutes later to stun the travelling support.
The rapid double salvo exposed United's vulnerability immediately following the break, undoing their earlier dominance.
Ruben Amorim was furious with Diogo Dalot during the match
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Amad Diallo emerged as United's saviour with a brilliant volley nine minutes from the final whistle.
The young winger's technical excellence ensured the visitors departed with their unbeaten record intact, though the euphoria of recent victories had dissipated.
The closing stages witnessed heightened tension as both sides pursued a winner.
Goalkeeper Senne Lammens demonstrated composure throughout, whilst the defensive trio of Luke Shaw, Leny Yoro and Matthijs de Ligt delivered respectable performances.
The dramatic finale preserved United's momentum under Amorim, though questions lingered about defensive concentration. The Portuguese manager's undefeated start continues ahead of their forthcoming fixture at Tottenham on 8 November.
Amorim directed sharp criticism towards compatriot Diogo Dalot following the left-back's troubled display.
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Journalist Samuel Luckhurst observed the manager "having a go" at the defender during the opening period, highlighting positional errors and missed opportunities.
"If you see Dalot, many times Dalot has the ball with space to make the cross, but he's a right-footer, he's always inside without space," Amorim explained post-match, addressing the tactical difficulties of deploying a right-footed player on the left flank.
Diogo Dalot was singled out by Ruben Amorim after the game
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The defender's struggles prompted his substitution for Patrick Dorgu after 69 minutes, with supporters voicing frustration online.
One fan branded him "a momentum killer", whilst another questioned Amorim's decision to persist with the underperforming player into the second period.