Created S3 objects are not visible in onyxia console or MinIO console

I am creating S3 objects from my RStudio workspace with:
```r
aws.s3::s3sync(path = folder,
bucket = "fbedecarrats",
prefix = paste0("diffusion/cantines/", folder), # diffusion to be able to share
create = FALSE,
region = "") # Important for the aws.s3 functions to work
```
The objects created with the first call of this function appear in Onyxia storage UI and the MinIO console. However, the objects created in the same place with the same command do not appear, neither in Onyxia storage UI or the MinIO console. But they are here, because they successfully load at startup with the following command in my init file:
```sh
mc mirror s3/fbedecarrats/diffusion/cantines/ **$WORK_DIR**
```
I can also find them at any moment from my RStudio console with:
```r
objects <- get_bucket_df(bucket = "fbedecarrats, region = "")
```
which returns all the elements contained in my S3 bucket and folder (the objects that I can see in Onyxia and MinIOconsole + the objects that I can't see in Onyxia and MinIOconsole).
Please tell me if you want me to create a reproducible example in some place you have access to.
(PS : I'm not overloading my issues with praises and thanks, but the spirit is still here :-)