The Bible contains many failed propehcies. In the Old Testament and used as proof of basically nothing correct, the WCG appealed to the Prophecy about Tyre to prove its validity. The prophecy about Tyre failed spectacularly to this day.
The Book of Revelation is a failed prophecy. Apologetics will insist it was for both then and now again but this is simply not true. Letting go of failed prophecy is not something the true believer does easily or at all.
The Apostle Paul, and others in the NT failed miserably in their understanding of the Second Coming in their time.
Paul ended up having to admit that prophecy, which he made many of in his "soon" and "shortly" preaching could and ultimately, did fail. I often wondered how many lives he somewhat ruined as they prepared by not marrying or "giving all", with his own prophetic wishful thinking.
"Love never fails. But where there are prophecies, they will fail" ,Paul was, at least, able to admit
(From the United Church of God)

Dave Pack can't "unveil" it, so he simply has to "explain" it
In our time, we have Fake Apostle and Notta-real-Minister, David C Pack, who is obcessed with predicting Christ's Second Coming, failing now again over his inarguable truth of it being, for sure, March 29th now past. This marks the 93rd false teaching on this topic for Dave in just the last two years.
Caught in his own prophectic loop, one wonders why does anyone listen to this charlatan anymore?
"These failed prophecies are not just mistakes. The reveal something deeper about the nature of belief, human psychology and the power of expectation"
"When scientific claims fail, they are discarded. When religious prophecies fail they are often reinterpreted, delayed or ignored."
"Science is willing to be wrong and adjust. While religious belief often bends reality to fit its narrative"
These 6 minutes explain the phenomenon of reworking failed prophecies so that one can pretend they did not fail....
...and why they stay.