Fix interpolation error.

[desrosj]

Follow up to Core-59484.

Trac ticket: https://core.trac.wordpress.org/ticket/62221

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[github-actions]

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Props desrosj, afercia.

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[afercia]

@desrosj thanks for your quick fix. Yes it fixes the issue for me.

[github-actions]

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[desrosj]

Merged in https://core.trac.wordpress.org/changeset/59489.