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This is by design. If you have zero or positive number in Match No JMeter's Post-Processor will return not more than one match, that's why you won't have this xxx_matchNr JMeter Variable.

As per Regular Expression Extractor documentation (the approach is applicable to all Post-Procesors)

Match No. (0 for Random)

Indicates which match to use. The regular expression may match multiple times.

Use a value of zero to indicate JMeter should choose a match at random.

A positive number N means to select the nth match.

Negative numbers are used in conjunction with the ForEach Controller - see below.

More information: Using RegEx (Regular Expression Extractor) with JMeter

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