This is the most common objection but I find the reasoning backwards. First, we know the phenomena is caused by a large lightning strike which is a high energy plasma event. As such we know where the energy to create and maintain the plasma ball comes from.
We don't - we assume. But a sustained phenomenon leads to complications. We need to explain: a/ how a short-lived pulse of energy can sustain the plasma over a minute or so -
energy storage and release is necessary; or b/
another energy source that is continuously available for the duration of the "plasma" ball.
Second, Researchers have also produced glowing plasma spheres from HV discharges in materials which is well documented.
No! (I just knew you would say that.) As of now it is not clear that the short-lived laboratory phenomena have anything to do with ball lightning. They
might be linked, but it is wrong (and typical) of you to accept that without question. When a lab experiment is set up to produce a (short-lived) ball of "plasma", it's not that surprising that it produces a short-lived ball of plasma. The evidence linking the two phenomena is definitely not there yet.
So we can say with a great deal of certainty the only thing which has changed is that the plasma spheres in question are much larger and last longer than expected.
Not a great deal of certainty - scientifically speaking it is far too early to use the term "certainty". And you are wrong to say "the only thing which has changed". The reason is that there are several ways of producing glowing balls in a lab, and it isn't clear which, if any, is ball lightning in miniature. Microwave interference in a waveguide; high voltage discharges in a tank of water; glowing nanoparticles; oxidation of vaporised silicon...... All have produced glowing balls (although I don't know which of these are widely reproducible).
On the reported ability to pass through solid materials such as glass and metal this is an outlier. Why would we discount all the demonstrable plasma science we already know just because a few people claimed to see something weird?.
Ah - so we reject evidence just because it is inconvenient? And no, we aren't discounting "all the demonstrable plasma science we already know". Exactly the opposite: if we
embrace the whole of plasma science, we end up unable to explain the spherical shape, the long duration, and the (reported) ability to pass through solid materials.