It is quite possible, in fact I started to think that way in the 1990s:

If an advanced civilization goes beyond the industrial era (the infinite exploitation of everything, which leads to the destruction of life), the next step is probably ecology (the industrial management of living things and their preservation), then one can imagine that when those 2 stages are crossed then a third occurs and that it constitutes the pinnacle of evolution: the harmonious non-industrial non-ecological integration with life, i.e. that in this stage a civilization would no longer leave any traces since it would no longer have any unnatural action, becoming indistinguishable from life (a garden would be indistinguishable from a piece of forest, a house would be a kind of biodegradable hut perched in the trees and in a symbiotic state with them, etc)

Imagine a 1 mm² memory cartridge (in fact we already have it with nano sd, but I had this thought in the 1990s way before it was possible), a 1 mm³ computer (we will soon be there), a thin transparent screen like cigarette paper or a screen made of biological material like the skin of cuttlefish which can change color on demand or a holographic screen therefore non-existent, etc ... Well in this situation if a major disaster occurs and that a collapse of civilization was happening (domino collapse of all the services necessary to maintain the societal mechanism, for example: electricity => IT => money => transport => trade => ...), then there are good chances that strictly no trace will remain of such a societal organization in the future.

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Another remark about this idea is that when time goes by, everything in the plain gets completely washed by water, so as to leave hardly any trace on the horizon of say 20 thousand years. This is why when we look beyond 20 thousand years we only find cavemen (the only place where traces remain), so would it be possible that a civilization existed in their time and that those of the caves were a bit like our homeless, excluded from said society? If that were the case we would have made horrible misinterpretations on this topic.

It's a funny idea, which I don't take to be true, but the underlying idea is interesting which is why I am presenting it here.

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Then the question can even be extended to the galaxy: if an alien society had developed to an ultimate point and then some kind of collapse had happened to them, the question is: in what ultimate form can we imagine that an extraterrestrial society organizes and spreads?

A quick reasoning would tell us that a civilization would first try to colonize the other planets itself, and thus becoming a galactic civilization, which is already a lot. But quickly it would become obvious that many biotopes are not habitable by said species, and that terraform then colonize then build something to start again would take from 300 years to a few thousand years depending on the initial conditions on the planet, which in fact a long and laborious process as well as risky.

While on the other hand, another method of colonization can be easily imagined: sending kinds of machines, robots that know how to replicate, evolve, adapt, and love to organize themselves in ever more complex and efficient forms. So the extraterrestrial species would have a way of exploring without really taking any risk or being present.

So it could very well be that it has already happened somewhere and that the progression of the process is invisible for now, or that it is visible and that what we call "life" is the result of this process…