Multiline named match with JavaScript regex not matching regex101

I'm trying to create a named match regex expression in JavaScript which captures build information from a multiline string. It tests fine in regex101 but fails to match correctly in JavaScript in a single pass of exec.

When I try the the following regex in JavaScript all that is matched is the first match, i.e. . Everything else shows up as undefined.

When I test the following in regex101.com

/(BuildTimestamp:)(?<timestamp>.*)|(VersionCode:)(?<major>.*)|(VersionName:)(?<minor>.*)/gm

BuildTimestamp:30-May-2023 14:25\r\n
VersionCode:6\r\n
VersionName:.0.5\r\n

I get the following matches:

timestamp: 30-May-2023 14:25
major: 6
minor: .0.5

In JavaScript I'm doing the following:

const regex = /(BuildTimestamp:)(?<timestamp>.*)|(VersionCode:)(?<major>.*)|(VersionName:)(?<minor>.*)/gm;

const match = regex.exec(contents);

If I put the exec in a loop I'm able to capture each named match in turn when exec is called. I'm hoping that there is a way to modify the regex query to capture all of them in one go.

The results of the first match are as follows

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