First, it is NOT the case that such miracles happen only in the RCC, but to the extent that "eucharistic" miracles in particular are reported more often in the RCC than in other denominations,
the RCC is the only Christian denomination that makes the eucharist into a magical act. That fact alone should be a red flag for you.
However, there is also a very real issue about whether the reported phenomena are genuine as claimed or if, instead, the events are either phony or unproven.
I recommend that you read this report by a person who was interested in the matter like you are but who also then did extensive research into the facts of the issue--
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MEDIA=reddit]excatholic/comments/elb7bz[/MEDIA
There are rules against copying lengthy quotes, but in order to get the whole report, put [ in front of the first character above and ] after the last one.
This is an excerpt--
"I'll outline a few points that I have found thus far:
- these miracles consistently occur in countries where the population is supermajority catholic (Poland, mexico, Argentina etc).
- there are no peer review papers or journals available to the general public, however there are seemingly experts claiming that they have happened.
- These scientists/doctors are either self identified Catholics, or of an unknown faith/disposition.
- All of these 'miracles' , appear to occur after transubination was questioned as doctrine in the 11th century (the one exception ive found is the miracle of Lanciono, which is claimed to have occurred in the 7th or 8th century, however there is no historical mention of it until its "rediscovery" in the 16th century).
- Modern miracles seem to follow almost the exact same formula or story, wherein a host is dropped on the ground, placed in holy water to dissolve, only for it later be discovered that the host has turned red, after which it is sent off for testing and determined to either be mold or, in some cases, allegedly flesh.
- The vatican has made no public/widespread announcements about any of these outside of the local level, but is perfectly happy selling books and tours in various places."