The vanilla spawn_rules\axolotl.json gives axolotl a density limit of 5 and a herd size of 4-6. The density limit thus prevents the max herd size from ever spawning.
MCPE-150161
Axolotl density limit is smaller than its max herd size
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703907, 1672401
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1.19.30.23 Preview, 1.18.10.28 Beta, 1.18.0, 1.19.0, 1.19.21 Hotfix, 1.20.0
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