While there isn't a technical limit, you will eventually hit a software limit, where you start overloading indexers, start hanging your http threads (because issue links will be loaded all at once on issue view), and you will generally start having slow issues which are affected with some performance hit to the instance overall.
Atlassian published https://confluence.atlassian.com/adminjiraserver/jira-software-guardrails-1141488685.html not that long ago which describes the limits with issue links, as well as several other things.
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