EDIT:
Stone brick(s) type blocks are inconsistently named:

• Stone BrickS Slab but Stone Brick_ Stairs [both same material, but differently named]
• BrickS Slab but Nether Brick_ Slab [Both brick slabs, but differently named]
• Stone BrickS but Stone Brick_ Monster Egg [Both same texture and partially same name, but still the S is inconsistent.]

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  1: if you type in "stone bricks" in the search tab, it will not show the stairs because they are stone brick_ stairs. (just without the S (_ representing the place where the S should be))

2: unlike all other ones:

• stone brickS slab
• stone brickS
• cracked stone brickS
• chiseled stone brickS
• mossy stone brickS
  stairs are the only one without the S

3: monster egg stone bricks are called
stone brick without the S
so if we search "stone bricks" we will NOT find monster eggs.
if we search without the S we will find monster eggs.

Summary
Different naming for practically the same block (material)

Possible solutions

• Renaming all of them to "stone bricks" or "stone brick" (without the monster eggs so it is convenient to find the non-monsteregg bricks)

• Renaming all of them AND the monster egg blocks.