Even if I would say it’s not but for the past bull runs, they actually happened after every bitcoin halving so perhaps bitcoin bull run is really tied to its bitcoin halving.
Bitcoin halving will make short term shocks in block rewards as well as income for Bitcoin miners but they will adapt to it and in past halvings, price grew well after that so miner income won't be affected too much by halve of block reward.
However, we must know one more thing, income of Bitcoin miners should come from transaction fees which come from their transaction confirmation for Bitcoin users. Block rewards were not designed to be main source of Bitcoin miner income.
Same here as I have also search every possible reason for the market to fall this drastically over a space of 12hours. This dump has caused many naive investor to panic because they all perceived that since we are heading close to the halving that Bitcoin will only push up but the sudden dip has surprise everyone but notwithstanding it can be still seen as a positive effect because we can use this medium to actually buy more Bitcoin.
When you search, you will find news and some information which will be released on media to officially explain why the market moves like that. They are not real reasons and you will realize it when you have been in this market long enough. Market manipulators direct the market into their favorite directions and plans. After they completed their plans, they will release news for you but in fact they all prepared those news before market crash. They only wait for a right time to release news which satisfies your curiosity and angry after losing money in the market.