R Under development (unstable) (2024-07-13 r86895 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(stars))
> set.seed(1331)
> st_sample(st_as_sfc(st_bbox(L7_ETMs)), 1)
Geometry set for 1 feature 
Geometry type: POINT
Dimension:     XY
Bounding box:  xmin: 291430.8 ymin: 9111430 xmax: 291430.8 ymax: 9111430
Projected CRS: SIRGAS 2000 / UTM zone 25S
POINT (291430.8 9111430)
> b = st_buffer(st_sample(st_as_sfc(st_bbox(L7_ETMs)), 1), 335)
> bba = stars:::st_align(st_bbox(b), st_dimensions(L7_ETMs))
> 
> plot(L7_ETMs[,,,1], extent = st_buffer(b, 20), reset = FALSE, key.pos = NULL)
> plot(b, add = TRUE, col = NA, border = 'red')
> plot(st_as_sfc(st_bbox(b)), col = NA, border = 'red', add = TRUE)
> plot(st_as_sfc(bba), col = NA, border = 'blue', add = TRUE)
> st_bbox(b)
     xmin      ymin      xmax      ymax 
 297116.8 9119404.1  297786.8 9120074.1 
> bba
     xmin      ymin      xmax      ymax 
 297098.3 9119392.8  297810.8 9120076.8 
> 
> plot(L7_ETMs[,,,1], reset = FALSE, key.pos = NULL)
> plot(b, col = 'red', add = TRUE)
> plot(st_as_sfc(bba), col = NA, border = 'blue', add = TRUE)
> 
> b0 = st_buffer(b, -100)
> L7 = st_as_stars(L7_ETMs)[b0][,,,1] |> st_normalize()
> bbb = stars:::st_align(st_bbox(b), st_dimensions(L7))
> plot(L7, extent = st_buffer(b, 120), reset = FALSE, key.pos = NULL)
> plot(st_as_sfc(st_bbox(L7)), col = NA, border = 'black', add = TRUE)
> plot(st_as_sfc(bbb), col = NA, border = 'blue', add = TRUE)
> plot(b, col = NA, border = 'red', add = TRUE)
> 
> all.equal(bbb, bba)
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   1.15    0.15    1.31